brake pedal for application of the brakes (column 4, lines 7-17). Nakamoto discloses
the following with respect to the actuation of the parking brake system:
The parking brake system A is actuated or de-
actuated under the control of an electromagnetic means,
generally designated at reference character B, which
comprises a reversible motor 5, a worm 6 provided on the
rotation shaft of the motor 5, a worm gear 7 in meshing
engagement with the worm 6, a speed-reduction gear 8
formed concentrically and integrally with the worm gear 7,
and a sector gear 9 meshed with the speed-reduction gear
8, the parking brake cable 2 being connected at its one end
to the sector gear 9. With this arrangement, when the motor
5 is driven to rotate in the forward direction, the parking
brake cable 2 is drown [sic] or pulled to the left in FIG. 1
through the gears 7 to 9 thereby to actuate the parking brake
A, whereas upon reverse rotation of the motor 2, the parking
brake cable 2 is slackened or returned to the original
condition through the action of the gears 7 to 9, thereby to
release the parking brake A. Connected to the sector gear 9
is a spring 10 which acts to urge the sector gear 9 to rotate
in the clockwise or counterclockwise direction, as viewedin
FIG. 1, with change-over point at which the action of the
spring 10 switches from one direction to the other being the
position at which the spring 10 extends through the center of
rotation or pivot point of the sector gear 9. Thus, the spring
10 serves to assist the brake-applying and brake-releasing
operations ofthe parking brake A caused under the drive of
the motor 5.
Also illustrated in FIG. 1 are a controller C for feeding
a brake-application command signal and a brake-release
command signal to the electromagnetic means B or the
motor 5; a group of sensors D adapted to detect the various
operating conditions of the vehicle and send out signals
representative of the operating conditions thus detected;and
an indicator E for displaying the output conditions of the
controller C. The controller C serves to control the operation
of the electromagnetic means B or the direction of rotation of
the motor 5 in accordance with the detected operating
conditions of the vehicle on the basisof the signals from the
sensors D [column 4, lines 18-57].
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Last modified: November 3, 2007